Ecological Factors and Diversification among Neotropical Characiforms

Figure 1

Diagram showing morphometric characters measured in examined fishes. M1 standard length; M2 distance from tip of snout to anterior margin of the eye; M3 perpendicular distance from upper edge of orbit to dorsal profile; M4 perpendicular distance from lower margin of orbit to ventral profile; M5 maximum diameter of orbit; M6 distance from tip of snout to origin of dorsal fin; M7 distance from tip of snout to origin of dorsal fin; M8 distance from tip of snout to dorsal point of insertion of pectoral fin; M9 distance from tip of snout to dorsal point of insertion of pelvic fin; M10 distance from tip of snout to dorsal point of insertion of pelvic fin; M11 distance from origin of dorsal fin to dorsal point of insertion of pelvic fin; M12 length of base of dorsal fin; M13 distance from origin of dorsal fin to origin of anal fin; M14 distance from origin of pelvic fin to origin of anal fin; M15 distance from terminus of base of dorsal fin to origin of pelvic fin; M16 distance from terminus of base of dorsal fin to origin of anal fin; M17 distance from terminus of base of dorsal fin to origin of adipose fin; M18 distance from terminus of base of adipose fin to origin of anal fin; M19 distance from terminus of base of anal fin, including to base of caudal fin; M20 width of caudal fin at its base; M21 length of longest dorsal fin ray; M22 length of longest pectoral fin ray; M23 length of longest pelvic fin ray; M24 length of base of anal fin; M25 length of longest anal fin ray; M26 distance from center of caudal peduncle to distal margin of caudal fin; M27 length of longest caudal fin ray; M30 interorbital width; M31 greatest width if central part of body; M32 width of middle of caudal peduncle.